air-gapped signing

Air-gapped signing keeps the private key on a device that never touches the internet.离线签名（air-gapped signing）将私钥保存在从不接触互联网的设备上。

Using a QR-code-based air-gapped signing flow, advanced users can approve transactions with maximum offline security.使用基于二维码的离线签名流程，高级用户可以以最大程度的离线安全性批准交易。